underscore in legend or title and set terminal noenhanced

[Petr Mikulik]

I have just noticed that the default terminal option is "set termoption 
enhanced", therefore having in filename with underscore (e.g. "a_1.dat") 
prints a funny title or legend.

It seems there is no "enhanced" field in get(gca) or get(gcf), is it?

Is there some easy or standard way (function) to replace _ by \_, such as 
gsub() in awk or e.g. noenhance_string()?

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PM